I have a s19 file that was developed and compiled using Cosmic tools. I previously used Zap debugger to flash the micro. I've now acquired a PEMicro USB BDM Multilink interface, and would like to use PROG12Z to flash my micros. How can I take the s19 compiled with Cosmic, and use PROG12Z to flash it? It asks for a .12p file which I do not have, and am unfamiliar with using.

The .12p file is the flash programming algorithm. In the PROG12Z installation directory, there is an "algorithms" folder which contains them. You should select the algorithm that matches the exact processor that you are using.

If you are unsure of which one to select, let us know the Freescale processor part number on your board.